body {
    background: url(../img/shree.jpg);
    background-size: cover;
    background-attachment: fixed;

}

.pcy {
    width: 270px;
    height: 140px;
    background-color: rgba(150, 150, 150, 0.3);
    margin: 0 auto;
}

.pcy h3 {
    text-align: center;
    letter-spacing: 30px;
    color: #2ECCFA;
    font-weight: 700;
    /* font-size: 50px; */
    font-family: "宋体";


}

.ty {
    color: pink;
}

form {
    /*水平垂直居中*/
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -100px;
    margin-left: -100px;
}